So, i was leveling a goblin and i thought the servers where lagging badly. Casting a spell and almost a second after the cast bar was complete and gone the spell came out. Ping was fine, fps was fine, Everything was fine.
Then i got to this place... I think i found the source of the lag
I cast one hand of gul'dan in there and in the 8 yard radius i hit aprox 280 mobs. So i guess there is 2-3k mobs there. And its just as bad the other way down to the beach.